Pigeon poop is rocket fuel ! I add it to beds in Autumn to over winter or in Spring for really greedy crops like pumpkins etc. just add it to the surface of the soil rather than digging it in and it'll wash in slowly.
I also add it to woodchips to speed up decomposition - from fresh chippings from the tree surgeons to black crumbly mulch in a season
it also makes great liquid
feed - put a sack full in a rain barrel and use
well diluted ........ make sure the barrel is away from the house, it stinks lol